Excavation based on the Tuve graves

Be kind, it is my first project. It is a ca 9 by 17 centimeter model of an excavation based on the early iron age graves in Tuve, Sweden. I used a thin 3d render provided by the Gothenburg City Museum, and added a frame to make it printable. The frame will need some work, use a scalpell and make lines to make it look like girders and not a solid object and a small dot of green stuff in each corner as a nail if you want. It is out of scale, but if the frame is worked on and painted like wood, an